Retry logic with CompletableFuture

Question

I need to submit a task in an async framework I\'m working on, but I need to catch for exceptions, and retry the same task multiple times before \"aborting\".

The code I

Answer 1

maybe it's late but hopes someone might find this useful, I recently solved this problem for retrying rest API call on failure. In my case, I have to retry on 500 HTTP status code, below is my rest client code (we are using WSClient from play framework) you can change it to whatever rest-client as per requirement.

 int MAX_RETRY = 3;
 CompletableFuture future = new CompletableFuture<>();

 private CompletionStage getWS(Object request,String url, int retry, CompletableFuture future) throws JsonProcessingException {
 ws.url(url)
        .post(Json.parse(mapper.writeValueAsString(request)))
        .whenCompleteAsync((wsResponse, exception) -> {
            if(wsResponse.getStatus() == 500 && retry < MAX_RETRY) {
                try {
                    getWS(request, retry+1, future);
                } catch (IOException e) {
                    throw new Exception(e);
                }
            }else {
                future.complete(wsResponse);
            }
        });

     return future;
}

This code will return immediately if the status code is 200 or other than 500 whereas if HTTP status is 500 it will retry 3 times.